diff --git a/library/src/calculator_functions.cpp b/library/src/calculator_functions.cpp
index 5f1bee2..9f8fdc2 100644
--- a/library/src/calculator_functions.cpp
+++ b/library/src/calculator_functions.cpp
@@ -491,7 +491,7 @@ double Calculator::GetCostFromDuration(Configuration* cfg, uint8_t payment_optio
         {
             LOG_DEBUG("- No workday found, trying to find next available day");
             inputDate = inputDate.addDays(1);
-            return GetCostFromDuration(cfg, payment_option, inputDate, end_datetime, durationMin, true, prepaid) / durationUnit;
+            return GetCostFromDuration(cfg, payment_option, inputDate, end_datetime, durationMin, true, prepaid);
         }
         worktime_from = QTime::fromString(cfg->WeekDaysWorktime.find(weekdayId)->second.pwd_time_from.c_str());
         worktime_to = QTime::fromString(cfg->WeekDaysWorktime.find(weekdayId)->second.pwd_time_to.c_str());
@@ -504,7 +504,7 @@ double Calculator::GetCostFromDuration(Configuration* cfg, uint8_t payment_optio
     {
         inputDate = inputDate.addDays(1);
         inputDate.setTime(worktime_from);
-        return GetCostFromDuration(cfg, payment_option, inputDate, end_datetime, durationMin, true, prepaid) / durationUnit;
+        return GetCostFromDuration(cfg, payment_option, inputDate, end_datetime, durationMin, true, prepaid);
     }
 
     // If overtime flag is set
@@ -534,7 +534,7 @@ double Calculator::GetCostFromDuration(Configuration* cfg, uint8_t payment_optio
         {
             LOG_DEBUG(" *** PREPAID *** Current time is past the time range end, searching for next available day");
             inputDate = inputDate.addDays(1);
-            return GetCostFromDuration(cfg, payment_option, inputDate, end_datetime, durationMin, true, prepaid) / durationUnit;
+            return GetCostFromDuration(cfg, payment_option, inputDate, end_datetime, durationMin, true, prepaid);
         }
     }
 
@@ -586,7 +586,7 @@ double Calculator::GetCostFromDuration(Configuration* cfg, uint8_t payment_optio
             LOG_DEBUG("Reached end of worktime, searching for the next working day");
             inputDate = inputDate.addDays(1);
             overtime = true;
-            return GetCostFromDuration(cfg, payment_option, inputDate, end_datetime, total_duration_min) / durationUnit;
+            return GetCostFromDuration(cfg, payment_option, inputDate, end_datetime, total_duration_min);
         }
 
         // Increment input date minutes for each monetary unit